Place the cream cheese, mascarpone and sugar into the bowl of a stand mixer. Using the flat paddle attachment, beat on medium speed until the mixture is soft and smooth.
In a separate bowl, whisk the cream until soft peaks form.
Fold the whipped cream into the cream cheese mixture, together with the lemon zest.
Transfer the cheesecake mixture to a large bowl, wrap with cling film, and leave in the fridge for about 24 hours.
For the Plum Compote
Place the plums, sugar and lemon juice into a medium saucepan.
Cook over medium heat for about 20-30 minutes, or until the plums have broken down and the mixture has thickened. The consistency should be a little runnier than jam (it will also thicken as it cools).
If the compote looks too thick, add a dash of water.
Set the plum compote aside to cool completely before serving.
For the Hazelnut Crumble
Preheat the oven to 190°C/370°F (without fan).
Place the flour, sugar, butter and ½ teaspoon salt into the bowl of a stand mixer. Using the flat paddle attachment, beat on low speed until the mixture resembles crumbly wet sand.
Stir through the hazelnuts and sesame seeds.
Spread the mixture out onto a baking tray.
Bake for 10-15 minutes, or until the crumble is lightly golden.
Set the crumble aside to cool completely before serving.
To serve
Spoon the cheesecake mixture into some glass bowls. Add a dollop of fruit compote to the side, followed by a generous sprinkle of the crumble topping.
I like to place a large bowl of the crumble at the table to allow guests to help themselves to more.
OVEN TEMPERATURES All recipes on this website state temperatures for a regular oven (i.e. a conventional oven without fan). If you have a convection oven with a fan, please consult the manufacturer's handbook on how to adjust the temperature and baking time accordingly.